Patents by Inventor Toomas R. Lumi

Toomas R. Lumi has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • A.C. to D.C. voltage converter
    Patent number: 4176393
    Abstract: An a.c. to d.c. voltage converter of this invention comprises an a.c. voltage amplifier whose inverting input is connected to a lead of an input resistor, and whose non-inverting input is grounded for alternating current. The converter further includes a non-linear detection unit having a separating capacitor, a diode with one electrode connected via the separating capacitor to the output of the a.c. voltage amplifier and the other electrode connected to the inverting input of the a.c. voltage amplifier, and a means for producing direct linear current through the input resistor connected in parallel with the diode and electrically coupled to the input of the converter. The a.c. to d.c. voltage converter of this invention provides for automatic filtering of detected signals and insures excellent time stability of the conversion coefficient.
    Type: Grant
    Filed: October 4, 1977
    Date of Patent: November 27, 1979
    Inventors: Toom A. Pungas, Tynis A. Laud, Kheino A. Reinberg, Raul-Vello P. Rebane, Toomas R. Lumi